Assertion (A): $3^{0}$ -amines have lower boiling points than isomeric $1^{0}$ and $2^{0}$ -amines.
Reason (R): $1^{0}$ and $2 °$ -amines can form intermolecular H-bonding but not $3 °$ -amines.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

$3^{0}$ -amines have lower boiling points than isomeric $1^{0}$ and $2 °$ -amines because:

- Boiling point decreases with branching

- Due to steric hindrance in $3^{0}$ -amines it cannot form intermolecular $H$ -bonding.

Thus, both assertion and reason are true and reason is the correct explanation of assertion. Hence, option (A) is correct.

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